论文标题
强抗铁磁接近耦合在异质结构超导体SR $ _2 $ vo $ _3 $ feas中
Strong antiferromagnetic proximity coupling in a heterostructured superconductor Sr$_2$VO$_3$FeAs
论文作者
论文摘要
我们报告观察在异质结构的超导体SR $ _2 $ _2 $ _3 $ feas中的强磁接近耦合，由上关键领域$ h_ {c2}（t）$测量最多65 t。 $H_{c2}^c(T)$, together with a steep increase of $H_{c2}^{ab}(T)$ near $T_c$, yielding the anisotropic factor $γ_H=H_{c2}^{ab}/H_{c2}^c$ up to $\sim$ 20, the largest value among iron-based superconductors.这些归因于jaccarino-peter效应，而不是多型效应，这是由于夫妇层的巡回交换与Mott-Mott usulating Srvo $ _3 $层之间的静态交换相互作用。这些发现提供了强烈的抗磁性接近耦合的证据，可与Srvo $ _3 $ layer的Intralayer superexchange互动相媲美，足以在SR $ _2 $ _3 $ _3 $ feas中引起磁性挫败感。
We report observation of strong magnetic proximity coupling in a heterostructured superconductor Sr$_2$VO$_3$FeAs, determined by the upper critical fields $H_{c2}(T)$ measurements up to 65 T. Using the resistivity and the radio-frequency measurements for both $H \parallel ab$ and $H \parallel c$, we found a strong upward curvature of $H_{c2}^c(T)$, together with a steep increase of $H_{c2}^{ab}(T)$ near $T_c$, yielding the anisotropic factor $γ_H=H_{c2}^{ab}/H_{c2}^c$ up to $\sim$ 20, the largest value among iron-based superconductors. These are attributed to the Jaccarino-Peter effect, rather than to the multiband effect, due to strong exchange interaction between itinerant Fe spins of the FeAs layers and localized V spins of Mott-insulating SrVO$_3$ layers. These findings provide evidence for strong antiferromagnetic proximity coupling, comparable with the intralayer superexchange interaction of SrVO$_3$ layer and sufficient to induce magnetic frustration in Sr$_2$VO$_3$FeAs.
